| http://www.w3.org/ns/prov#value | - Related Art StatementIn lathes, grinders and other machine tools for cutting or grinding workpieces during rotation thereof, a holding means referred to as a center generally used to support the workpiece rotatably about its axis, by means of engagement of bearingends of the center with the corresponding opposite ends of the workpiece.Materials for such centers for supporting a workpiece rotatab
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